Carburetor improvement



Feb. 27, 1945. $HNE|DER 2,370,584

CARBURETOR IMPROVEMENT Filed June 23, 1945 INVENTOR EDGAR R. SCHNEIDER ATTORNEY Patented Feb. 27, 1945 CARBURETOR IMPROVEMENT Edgar R. Schneider, St. Louis, Mo., assignor to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Delaware Application June 23,1943, Serial No. 492,191

4 Claims. (Cl. 287-53) This invention relates to carburetors for internal combustion engines and more particularly concerns carburetor throttle operating levers used in connection therewith.

It is the primary object of the present invention to provide an inexpensive, conveniently detachable throttle operating lever.

Other objects and advantages will appear upon reference to the following description and accompanying drawing referring to which:

Fig. 1 is a side elevation of a modern carburetor incorporating a form of the present invention.

Fig. 2 is a fragmentary portion of the carburetor shown in Fig. 1 taken on line 2--2 of Fig. 1.

Fig. 3 is an enlarged view of a portion of the operating lever.

Numeral I generally indicates a modern carburetor having a mixture conduit 2. let of the mixture conduit is controlled by a butterfly-type throttle valve 3 which is rigidly mounted on a rotatable shaft 4. 'The shaft 4 is J'ournalled at its ends in the walls ofthe mixture conduit at 5 and 6 and projects substantially through one wall as indicated at 1. The projecting end of shaft 4 is milled flat for some distance from its end as indicated at 8.

A throttle operating lever is generally indicated at 9. The lever B is provided with a D- shaped perforation l adapted to receive in slipfit relationship the fiatted projecting end of shaft 4. Lever 9 is further provided with an arm perforated near its outer end at H to receive an operating rod (not shown) and an arm l2 which carries in threaded engagement an adjustable stop screw 13. Cast integral with the carburetor body is an abutment M which is engaged by the stop screw l3 to limit the closing movement of the throttle valve. Lever 9 is also provided with a projection l which engages the abutment M to provide a wide open throttle valve stop.

It will be understood that to permit economical manufacture, dimensional tolerances will be necessary to insure the interchangeable slip-fit assembly of the lever on the shaft. It will also be seen, however, that any looseness of the lever on the shaft due to this necessary tolerance will be multiplied at the edge of the butterfly throttle valve and as this would seriously affect the selected idling speed, it must be prevented. To overcome this difficulty, I have provided a coiled spring I6 h'aving its inner end attached to shaft 4 by passing through a perforation l1 therein and having its outer end bearing against the lever The outat I8. as indicated at E9 and circling the projecting end of stop screw Hi. It will be seen with this arrangement that any lost motion between the shaft 4 "and lever 9 will be taken up as shown in a somewhat exaggerated condition in Fig. 3 by the spring l6 and that the lever 9 is keyed by the inner end of the spring which passes through the shaft preventing the longitudinal movement on the shaft.

The foregoing description and accompanying drawing are intended to be illustrative and not limiting and the exclusive use of all modifications within the scope of the appended claims is contemplated.

I claim:

1. The combination of a rotatable valve shaft having a non-circular end portion, an operating lever having a perforation substantially similar in shape to said non-circular shaft end and of such size as to receive said shaft end for limited rotation relative thereto, and resilient means for urging said lever in a rotational direction with respect to said shaft whereby any lost motion due to the free fit of the lever on the shaft is resiliently taken up.

2 The combination of a rotatable valve shaft and an operating lever, said shaft having a noncircular end portion of reduced section providing a shoulder spaced from the end thereof, said lever having a perforation substantially similar in shape to said non-circular shaft end and of such dimensions as to permit the free slip-fit assembly of the lever on the shaft, said shaft being further characterized by a cross bore near the outer end. of the reduced portion, and a coiled spring having one end passing through said cross bore and its other end bearing against said lever whereby said lever is urged in a rotational direction with respect to said shaft and restrained longitudinally by said shoulder and the inner end of aid spring.

3. In combination, a rotatable valve shaft, an operating lever mounted on said shaft and capable of limited rotation relative thereto, and resilient means normally urging said lever into one of its extreme positions relative to said shaft.

4. In combination, a rotatable shaft, an operating lever mounted thereon and capable of limited lost motion relative thereto, and a torsion spring stressed between said shaft and lever and normally maintaining said lever in oneof its extreme positions relative to said shaft.

EDGAR R. SCHNEIDER.

The outer end of the spring I6 is coiled 

